Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at s√ = 8 TeV

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dc.contributor.authorAad, G.
dc.contributor.authorAbbott, B.
dc.contributor.authorAbbott, D.C.
dc.contributor.authorAbed Abud, A.
dc.contributor.authorAbeling, K.
dc.contributor.authorAbhayasinghe, D.K.
dc.contributor.authorAbidi, S.H.
dc.contributor.authorAbouZeid, O.S.
dc.contributor.authorAbraham, N.L.
dc.contributor.authorAbramowicz, H.
dc.contributor.authorAlbert, Justin
dc.contributor.authorAnelli, Christopher R.
dc.contributor.authorCarlson, Evan Michael
dc.contributor.authorChiu, Y. H.
dc.contributor.authorGhasemi Bostanabad, M.
dc.contributor.authorHamano, Kenji
dc.contributor.authorKay, E. F.
dc.contributor.authorKeeler, Richard
dc.contributor.authorKowalewski, Robert
dc.contributor.authorLefebvre, Michel
dc.contributor.authoret al.
dc.date.accessioned2021-01-27T00:11:02Z
dc.date.available2021-01-27T00:11:02Z
dc.date.copyright2020en_US
dc.date.issued2020
dc.description.abstractThe combination of measurements of the W boson polarization in top quark decays performed by the ATLAS and CMS collaborations is presented. The measurements are based on proton-proton collision data produced at the LHC at a centre-of-mass energy of 8 TeV, and corresponding to an integrated luminosity of about 20 fb−1 for each experiment. The measurements used events containing one lepton and having different jet multiplicities in the final state. The results are quoted as fractions of W bosons with longitudinal (F0), left-handed (FL), or right-handed (FR) polarizations. The resulting combined measurements of the polarization fractions are F0 = 0.693 ± 0.014 and FL = 0.315 ± 0.011. The fraction FR is calculated from the unitarity constraint to be FR = −0.008 ± 0.007. These results are in agreement with the standard model predictions at next-to-next-to-leading order in perturbative quantum chromodynamics and represent an improvement in precision of 25 (29)% for F0 (FL) with respect to the most precise single measurement. A limit on anomalous right-handed vector (VR), and left- and right-handed tensor (gL, gR) tWb couplings is set while fixing all others to their standard model values. The allowed regions are [−0.11, 0.16] for VR, [−0.08, 0.05] for gL, and [−0.04, 0.02] for gR, at 95% confidence level. Limits on the corresponding Wilson coefficients are also derived.en_US
dc.description.reviewstatusRevieweden_US
dc.description.scholarlevelFacultyen_US
dc.identifier.citationAad, G., Abbott, B., Abbott, D. C., Abed Abud, A., Abeling, K., Abhayasinghe, D. K., … Zwalinski, L. (2020). Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at s√s = 8 TeV. Journal of High Energy Physics, 2020(8). https://doi.org/10.1007/JHEP08(2020)051en_US
dc.identifier.urihttps://doi.org/10.1007/JHEP08(2020)051
dc.identifier.urihttp://hdl.handle.net/1828/12607
dc.language.isoenen_US
dc.publisherJournal of High Energy Physicsen_US
dc.subjectHadron-Hadron scattering (experiments)
dc.subjectTop physics
dc.subject.departmentDepartment of Physics and Astronomy
dc.titleCombination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at s√ = 8 TeVen_US
dc.typeArticleen_US

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